Life and career
Arnot was raised just outside Glacier National Park in Whitefish, Montana. After college, she began living out of her car to save money and climb mountains. She first climbed Mount Rainier in 2001 and called it a "watershed moment". She began teaching wilderness medicine in 2002 and began guiding on Mount Rainier with Rainier Mountaineering, Inc. in 2004. By 2006 she was a lead guide.
In 2010, she led a celebrity climb up Mount Kilimanjaro to raise awareness for clean water access. The effort, Summit on the Summit, included actors Emile Hirsch, Jessica Biel and Isabel Lucas, musicians Kenna, Lupe Fiasco and Santigold, as well as various scientists and activists, and aired as an MTV special.
She is currently sponsored by Eddie Bauer and was one of the original six mountain guides, also including Peter Whittaker, Ed Viesturs, Dave Hahn, Seth Waterfall and Chad Peele, who developed products for the First Ascent brand and continues to participate in product development and testing. She is also sponsored by Whittaker Mountaineering, a retail store based in Ashford, Washington.
Arnot's summit attempts in 2014 and 2015 were disrupted by avalanches at Mount Everest.
In 2016, she became the first American woman to summit Mount Everest and survive the descent without supplemental oxygen; Francys Arsentiev, also an American woman, reached the summit without oxygen in 1998 but died during the descent.
Arnot’s notable big mountain ascents include:
- 92 summits of Mount Rainier (14,410')
- 6th summit of Mount Everest in 2016
- 5 summits of Mount Everest (29,029') by 2012, (South Col route) 
- 3 summits of Aconcagua, Argentina (22,841')
- 1 expedition on Denali (20,320')
- 5 summits of Cotopaxi, Ecuador (19,348')
- 2 expeditions on Cayambe, Ecuador (18,997')
- "Melissa Arnot (Facebook Athlete Page)". Retrieved October 5, 2016.
- Eun Kyung Kim (2015-04-21). "Melissa Arnot, history-seeking Everest climber, reveals training plan". TODAY.com. Retrieved 2016-05-25.
- Mount Everest: American Woman Summits Without Supplemental O2
- "Melissa Arnot profile". Whittaker Mountaineering. Retrieved 14 November 2011.
- "Melissa Arnot, WEMT, Instructor". Remote Medical International. Archived from the original on December 2, 2011. Retrieved November 14, 2011.
- Warnick, Jennifer. "Life After Everest Is a Breeze". Join (RED). Retrieved 14 November 2011.
- "Melissa Arnot". Summit on the Summit. Retrieved November 14, 2011.
- Kaufman, Gil. "Kenna, Summit On The Summit Team Reach Top Of Kilimanjaro". MTV. Retrieved November 14, 2011.
- "Guide Built". Eddie Bauer. Retrieved November 14, 2011.
- "The Whittaker Mountaineering Guide Team". Retrieved 4 May 2012.
- Landers, Rich. "Melissa Arnot climbs into Mount Everest record book | The Spokesman-Review". Spokesman.com. Retrieved 2016-05-25.
- "Eddie Bauer First Ascent Guides Hahn and Arnot Set New Everest Records". PRNewswire. Retrieved June 13, 2012.
- "Melissa Arnot". RMI Guides. Retrieved November 14, 2011.